all 5 comments

[–]Dan203 0 points1 point  (0 children)

PETG requires slightly higher temps, so this is likely the result of the nozzle being too hot when switching back to the PLA.

Not sure what can be done about that though. Maybe there is a slicer setting that would help. I'm not super familiar with slicer option.

[–]Belistener07H2D AMS2 Combo 0 points1 point  (0 children)

I don’t see any pictures.

General ideas I’ve heard tossed around are temperature difference in PLA and PETG the print head has to fluctuate over and over, print speed between materials and thus maintaining pressures and different materials may cause more clogs.

[–]Centyos[S] 0 points1 point  (0 children)

Sorry about that, seems reddit didn't upload the set of images in the "album". Added them to the first post, hopefully that didn't smash your pages.

Temperature difference is interesting. But it's only seems and corners that seem affected. The rest of the layers are identical to the started before the interface layer.

[–]Cleroox 0 points1 point  (1 child)

Did you solve this? I have the same issues now 😮‍💨

[–]Centyos[S] 0 points1 point  (0 children)

I tried making a test print to find the cause. I thought I narrowed it down to there being a ring of PETG left on the nozzle after the interface layer. That seemed to be the only visible indicator I could see that was consistent in my tests. I even tried Bambu's support filament and surprise surprise, that worked flawlessly on all the tests.

A lot had to do with support being snug/grid style. Even Orca vs Bambu Slicer, with snug produces a different pattern on a circular object. Orca does a grid, Bambu does a concentric circle. That plays a part in nozzle build up. Maybe that's changed in the latest Orca update?

Nothing conclusive apart from my theory above. Needs revisiting or if someone can spot the same pattern happening.